如图所示,在水平放置的光滑金属板中点的正上方,有带正电的点电

如图所示,在水平放置的光滑金属板中点的正上方,有带正电的点电荷Q.一表面绝缘、带正电的金属球(可视为质点,且不影响原电场)以速度v0开始在金属板上向右运动,在运动过程中(        ).

(A)小球减速后作加速运动

(B)小球作匀速直线运动

(C)小球受电场力的冲量为零

(D)以上说法可能都不正确

答案

B

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